Python i18n API. Many thanks to Campbell and Brecht for the reviews and suggestions!

This commit adds:
* A new bpy.app.translations module giving some info about locales/translation stuff (current active locale, all locales currently known by blender, all translation contexts currently defined, etc.).

* The ability for addons to feature translations, using the (un)register functions of above module.

* Also cleans up "translate py string when storing into RNA prop" by removing "PROP_TRANSLATE" string's subtype, and adding a PROP_STRING_PY_TRANSLATE flag instead (this way it is no more exposed to python...).

Addon translations work with py dictionaries: each addon features a dict {lang: {(context, message): translation, ...}, ...}, which is registered when the addon is enabled (and unregistered when disabled). 

Then, when a key (context, message) is not found in regular mo catalog, a cache dict for current locale is built from all registered addon translations, and key is searched in it.

Note: currently addons writers have to do all the work by hand, will add something (probably extend "edit translation" addon) to automate messages extraction from addons soon(ish)! To get a look to expected behavior from addons, have a look at render_copy_settings/__init__.py and render_copy_settings/translations.py (rather stupid example currently, but...). Once we have a complete process, I'll also update relevant wiki pages.

source/blender/python/intern/bpy_app_build_options.c

@@ -32,7 +32,7 @@
 static PyTypeObject BlenderAppBuildOptionsType;
 
 static PyStructSequence_Field app_builtopts_info_fields[] = {
-	/* names mostly follow CMake options, lowecases, after WITH_ */
+	/* names mostly follow CMake options, lowercase, after WITH_ */
 	{(char *)"bullet", NULL},
 	{(char *)"codec_avi", NULL},
 	{(char *)"codec_ffmpeg", NULL},
@@ -71,7 +71,7 @@ static PyStructSequence_Field app_builtopts_info_fields[] = {
 
 static PyStructSequence_Desc app_builtopts_info_desc = {
 	(char *)"bpy.app.build_options",     /* name */
-	(char *)"This module contains information about FFmpeg blender is linked against",    /* doc */
+	(char *)"This module contains information about options blender is built with",    /* doc */
 	app_builtopts_info_fields,    /* fields */
 	(sizeof(app_builtopts_info_fields) / sizeof(PyStructSequence_Field)) - 1
 };